//
//  FeatureIntroView.swift
//  QuickLocation
//

import UIKit

struct FeatureIntroItem {
    let title: String
    let subtitle: String
    let background: UIColor
    let titleColor: UIColor
    let subtitleColor: UIColor
    let arrowTint: UIColor
    let action: FeatureIntroAction
}

enum FeatureIntroAction {
    case signIn
    case createBubble
    case lockDistract
    case searchLocation
    case sos
    case placeholder
}

final class FeatureIntroView: UIView {

    var onTapItem: ((FeatureIntroAction) -> Void)?

    private let headerTitleLab = UILabel()
    private let headerSubLab = UILabel()
    private let sheet = UIView()
    private let grid = UIStackView()

    private let items: [FeatureIntroItem] = [
        FeatureIntroItem(
            title: "还在吗？",
            subtitle: "每日打卡签到 记录美好生活",
            background: UIColor(hexStr: "#EDE7FF"),
            titleColor: UIColor(hexStr: "#5B4B8A"),
            subtitleColor: UIColor(hexStr: "#8B7BB8"),
            arrowTint: UIColor(hexStr: "#7B6AAE"),
            action: .signIn
        ),
        FeatureIntroItem(
            title: "隐身气泡",
            subtitle: "只想做个淡人 默默隐身",
            background: UIColor(hexStr: "#D9ECFF"),
            titleColor: UIColor(hexStr: "#2F6FAE"),
            subtitleColor: UIColor(hexStr: "#6A9BC4"),
            arrowTint: UIColor(hexStr: "#3E8FD0"),
            action: .createBubble
        ),
        FeatureIntroItem(
            title: "一键锁机",
            subtitle: "专注当下 拒绝手机干扰",
            background: UIColor(hexStr: "#DDF5E8"),
            titleColor: UIColor(hexStr: "#2F8A5B"),
            subtitleColor: UIColor(hexStr: "#6AAD88"),
            arrowTint: UIColor(hexStr: "#3EAE72"),
            action: .lockDistract
        ),
        FeatureIntroItem(
            title: "飞鸽传书",
            subtitle: "实时查看位置 守护安全出行",
            background: UIColor(hexStr: "#FFF3D6"),
            titleColor: UIColor(hexStr: "#A67C2D"),
            subtitleColor: UIColor(hexStr: "#C4A46A"),
            arrowTint: UIColor(hexStr: "#C9953A"),
            action: .placeholder
        ),
        FeatureIntroItem(
            title: "查位置",
            subtitle: "实时查看位置 守护安全出行",
            background: UIColor(hexStr: "#D6F4F2"),
            titleColor: UIColor(hexStr: "#2A8A84"),
            subtitleColor: UIColor(hexStr: "#66B0AB"),
            arrowTint: UIColor(hexStr: "#35A8A0"),
            action: .searchLocation
        ),
        FeatureIntroItem(
            title: "SOS",
            subtitle: "紧急求助 一键呼叫",
            background: UIColor(hexStr: "#FFE4E8"),
            titleColor: UIColor(hexStr: "#D6455D"),
            subtitleColor: UIColor(hexStr: "#E28A98"),
            arrowTint: UIColor(hexStr: "#E2556C"),
            action: .sos
        )
    ]

    override init(frame: CGRect) {
        super.init(frame: frame)
        backgroundColor = UIColor(hexStr: "#F0F1F3")
        setupUI()
    }

    required init?(coder: NSCoder) { fatalError("init(coder:) has not been implemented") }

    private func setupUI() {
        headerTitleLab.text = "功能介绍"
        headerTitleLab.font = .systemFont(ofSize: 28, weight: .bold)
        headerTitleLab.textColor = UIColor(hexStr: "#1F2A44")
        addSubview(headerTitleLab)
        headerTitleLab.layoutChain.top(kStatusBarHeight + 20).left(20)

        headerSubLab.text = "视频+图片"
        headerSubLab.font = .systemFont(ofSize: 28, weight: .bold)
        headerSubLab.textColor = UIColor(hexStr: "#1F2A44")
        addSubview(headerSubLab)
        headerSubLab.layoutChain.topToBottomOfView(headerTitleLab, offset: 2).left(20)

        sheet.backgroundColor = .white
        sheet.layer.cornerRadius = 28
        sheet.layer.maskedCorners = [.layerMinXMinYCorner, .layerMaxXMinYCorner]
        sheet.clipsToBounds = true
        addSubview(sheet)
        sheet.layoutChain
            .topToBottomOfView(headerSubLab, offset: 24)
            .edgesHorzontal()
            .bottom()

        grid.axis = .vertical
        grid.spacing = 12
        grid.distribution = .fillEqually
        sheet.addSubview(grid)
        grid.layoutChain
            .top(24)
            .edgesHorzontal(16)
            .bottom(24 + 70) // leave room for custom tab bar

        for row in 0..<3 {
            let rowStack = UIStackView()
            rowStack.axis = .horizontal
            rowStack.spacing = 12
            rowStack.distribution = .fillEqually
            for col in 0..<2 {
                let item = items[row * 2 + col]
                let card = FeatureIntroCardView(item: item)
                card.addTarget(self, action: #selector(cardTapped(_:)), for: .touchUpInside)
                card.tag = row * 2 + col
                rowStack.addArrangedSubview(card)
            }
            grid.addArrangedSubview(rowStack)
        }
    }

    @objc private func cardTapped(_ sender: FeatureIntroCardView) {
        let idx = sender.tag
        guard items.indices.contains(idx) else { return }
        onTapItem?(items[idx].action)
    }
}

final class FeatureIntroCardView: UIControl {
    private let titleLab = UILabel()
    private let subLab = UILabel()
    private let arrowBtn = UIView()

    init(item: FeatureIntroItem) {
        super.init(frame: .zero)
        backgroundColor = item.background
        layer.cornerRadius = 20
        clipsToBounds = true

        titleLab.text = item.title
        titleLab.font = .systemFont(ofSize: 18, weight: .bold)
        titleLab.textColor = item.titleColor
        addSubview(titleLab)
        titleLab.layoutChain.top(16).left(14).right(14)

        subLab.text = item.subtitle
        subLab.font = .systemFont(ofSize: 11, weight: .medium)
        subLab.textColor = item.subtitleColor
        subLab.numberOfLines = 2
        addSubview(subLab)
        subLab.layoutChain.topToBottomOfView(titleLab, offset: 6).left(14).right(14)

        arrowBtn.backgroundColor = .white
        arrowBtn.isUserInteractionEnabled = false
        arrowBtn.layer.cornerRadius = 14
        addSubview(arrowBtn)
        arrowBtn.layoutChain.left(14).bottom(14).width(28).height(28)

        let arrow = UIImageView(image: UIImage(systemName: "chevron.right"))
        arrow.tintColor = item.arrowTint
        arrow.contentMode = .scaleAspectFit
        arrowBtn.addSubview(arrow)
        arrow.layoutChain.center().width(10).height(12)
    }

    required init?(coder: NSCoder) { fatalError("init(coder:) has not been implemented") }
}